Putting strings into flash with PSTR and PGM_P
Posted: Tue Feb 27, 2018 2:14 pmI've read the excellent documentation "Guide to PROGMEM on ESP8266 and Arduino IDE" in the docs, but still can't get my application to work.
I want to store strings in flash, to free up RAM, and I need to read them a character at a time. Here's a demo program:
This gives errors when I try and compile - help much appreciated.
Thanks, David
I want to store strings in flash, to free up RAM, and I need to read them a character at a time. Here's a demo program:
Code: Select all
void pfstring (PGM_P s) {
intptr_t p = (intptr_t)s;
while (1) {
char c = pgm_read_byte(p++);
if (c == 0) return;
Serial.print(c);
}
}
void Test () {
pfstring(PSTR("Printed from Test"));
}
void setup() {
Serial.begin(9600);
Serial.println();
Test();
}This gives errors when I try and compile - help much appreciated.
Thanks, David